Do WLAN devices support hot-standby backup


ACs support hot-standby backup.
Two hot-standby backup modes are available: HSB+VRRP and HSB+dual-link backup. HSB+VRRP backup implements traffic switching through VRRP, while HSB+dual-link backup implements traffic switching through dual links.
Hot-standby backup achieves service backup of two ACs. HSB+VRRP applies only to the active/standby mode, whereas HSB+dual-link backup applies to both the active/standby and load balancing modes.

Other related questions:
What is hot-standby backup of WLAN devices
In hot-standby backup mode, one AC acts as the master AC and the other acts as the backup AC. The master AC forwards services and the backup AC monitors data forwarding. The master AC also periodically sends status information and information that needs to be backed up to the backup AC. If the master AC becomes faulty, the backup AC takes over services. On a WLAN, an AC can manage several hundreds of APs. If an AC is faulty, services on all APs associated with the AC are interrupted. Therefore, AC reliability is vital to network availability. Two hot-standby backup modes are available: HSB+VRRP and HSB+dual-link backup HSB+VRRP and HSB+dual-link backup can improve network availability. HSB supports batch backup and real-time backup between two access devices. Before link switching, the standby AC synchronizes information from the active AC. When the active AC fails, service traffic is immediately switched to the standby AC without interrupting services. This improves connection reliability. Dual-link backup or VRRP can rapidly detect whether the active AC is faulty so that the standby AC can change to active state quickly. This function ensures user service continuity. Pay attention to the following points when deploying hot-standby backup on ACs: - Hot-standby backup supports only backup between two ACs, and the models and software versions of the ACs must be the same. - WLAN service configurations (for example, WMM profile, radio profile, radio, traffic profile, security profile, and WLAN ID) of the AP connected to the active and standby ACs must be consistent on the two ACs; otherwise, the AP cannot work properly after an active/standby AC switchover.

Two-node cluster hot backup of a WLAN device fails
Two-node cluster hot backup modes include HSB+VRRP and HSB+dual-link. HSB+VRRP hot backup implements traffic switching through VRRP, and HSB+dual-link hot backup implements traffic switching through dual links. - For details on troubleshooting of HSB+VRRP hot backup faults, see: VRRP HSB Fails. - For details on troubleshooting of HSB+dual-link hot backup faults, see: HSB Between Two Links Fails.

On a hot standby network, what do designated active device and designated standby device stand for
On load balancing networks, the two FWs are active. Therefore, if both FWs synchronize commands to each other, command overwrite or conflict problems may occur. To centrally manage the configurations of the two FWs, you need to configure the designated active and standby devices. On load balancing networks, the sender of the configuration backup command is the designated active device (identified by HRP_M), and the receiver is the designated standby device (identified by HRP_S). Configuration commands can be synchronized only from the designated active device to the designated standby device, and status information is mutually backed up between the two devices. On load balancing networks, the FW with a smaller sysname American Standard Code for Information Interchange (ASCII) character is the designated active device. For example, when FW_A and FW_B share load, FW_A is the designated active device.

Whether the standby device in hot standby deployment can be configured
By default, configurations that can be backed up can be configured only on the active device and automatically synchronized to the standby device. You cannot configure them on the standby device. After you run the hrp slave config enable command on the active device, the standby device obtains the permission for configuring these commands when this command is backed up to the standby device. The configurations on the standby device are also synchronized to the active device. Configurations that cannot be backed up, such as interface IP addresses, can be configured on the standby device.

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